just got my 3 back from dealer. service guy said everything went great and it seems to run good but when i come to a stop the idle seems to be rough for a couple of seconds. then it seems to smooth out and if it idles long enough at a light it may stumble again. has anyone had this problem before or after head replacement?

 

Sounds like the MAF is dirty or acting up, or the Throttle body is dirty...

 

Question: What exactly tipped you off to the problem with the head?